JPS5843678B2 - Exhaust gas treatment equipment in steelmaking facilities - Google Patents

Description

Detailed Description of the Invention The present invention uses a steam turbine that uses steam generated in the exhaust gas treatment device in combination with an electric motor to drive an induced draft fan of the exhaust gas treatment device in steel manufacturing equipment. The present invention relates to an exhaust gas treatment device that can be used in steelmaking equipment, which achieves effective utilization of steelmaking equipment, reduction of power consumption in steelmaking equipment, and improvement in safety of steelmaking equipment during power outages.

Generally, due to the special characteristics of steelmaking equipment, blowing and non-blowing are performed intermittently after a certain period of time, and the exhaust gas generated accordingly is also generated intermittently.

In addition, steam generated by cooling the exhaust gas and absorbing heat from the exhaust gas is also generated intermittently.

In this way, the steam generated from the exhaust gas treatment equipment in steelmaking facilities is intermittent, so it is only used for factory steam, such as heating purposes, and the excess steam, especially in the summer, is dissipated into the atmosphere. .

In addition, the induced draft fan used in exhaust gas treatment equipment was only driven by an electric motor.

Most of the electricity consumption in steelmaking equipment is for driving this induced draft fan, which has the disadvantage of high operating costs, considering that the steam generated from the exhaust gas treatment equipment is not used effectively. there were.

In addition, if the electric motor driving the induced draft fan stops during a power outage, the coolers and dust collectors that make up the equipment, especially in the case of sub-valve gas processing equipment that collects unburned exhaust gas, will be damaged. It is necessary to scavenge the slender gas that has accumulated in a part of the vessel or duct to eliminate the risk of explosion. Conventionally, there is no other way than to scavenge using an induced draft fan that rotates due to inertia. I couldn't guarantee perfection.

The present invention makes effective use of the steam intermittently generated from the exhaust gas treatment equipment, reduces the power consumption of the steelmaking equipment, and improves the safety of the steelmaking equipment by completely scavenging the inside of the exhaust gas treatment equipment even during a power outage. The purpose is to obtain an exhaust gas treatment device that can

That is, the present invention temporarily stores steam generated from a non-gas treatment device in a steel manufacturing facility in an accumulator 1, and leads the thus stored steam to an independent superheater to produce superheated steam at a certain temperature, or A bypass circuit is provided to bypass the steam turbine, and the steam turbine is driven by the saturated steam that has passed through this bypass circuit or the superheated steam that has passed through the independent superheater, and the steam turbine and induced draft fan are connected using an automatic disconnection connection device. At the same time, a separately provided electric motor and induced draft fan are connected by an automatic disconnection/connection device, and the steam turbine and the electric motor are used together to drive the induced draft fan.

In other words, when steelmaking equipment starts operating or restarts after being stopped for a long time, the electric motor starts operation while no steam is generated from the exhaust gas treatment equipment, and the equipment continues to operate as usual. The present invention is characterized in that when steam is generated, the steam turbine is automatically switched to drive the induced draft fan.Details of the present invention will be described below with reference to embodiments.

As shown in the figure, exhaust gas generated in a converter 1 is cooled in a cooler 2, dust is removed in a dust collector 3, and is discharged from a chimney 6 through a duct 4.

Or, in the case of an exhaust gas treatment device that collects unburned 11
Without discharging from the chimney 6, operate the three-way valve 29 and release the recovery valve 30.
is opened and collected as valuable gas into the gas holder 28 through the V-type water seal valve 27.

5 is an induced draft fan.

The induced draft fan 5 is connected to a steam turbine 9 and an electric motor 10 for driving the induced draft fan 5 via automatic disconnection and connection devices 7 and 8 such as fluid couplings or powder couplings.

Reference numeral 11 denotes a circulation pump for supplying cooling water into the heat transfer section forming the heat transfer surface of the cooler 2.

12 is a drum; the water heated by the cooler 2 enters the drum 12 under the pump pressure of the circulation pump 11, where it is separated into steam and water, and the saturated water is circulated again by the circulation pump 11.

On the other hand, steam is led to and stored in the accumulator 13.

The saturated steam stored in the accumulator 13 is guided to the independent superheater 14 via the flow control valve 21, and becomes superheated steam at a certain temperature.

This superheated steam is guided to the steam turbine 9 to drive the steam turbine.

The steam leaving the steam turbine 9 becomes saturated water by the condenser 15 and enters the water supply tank 16.

Water accumulated in the water supply tank 16 is supplied to the drum 12 through the water supply pipe 1γ.

22 is a fuel control valve, and 24 is a bypass valve that bypasses the independent superheater 14.

25 is a conduit for guiding steam generated in other exhaust gas treatment equipment to the accumulator 13, 26 is a conduit for guiding steam to other exhaust gas treatment equipment, and the steam generated from multiple exhaust gas treatment equipment is routed to one accumulator. This is something I stopped a long time ago on the 13th.

Of course, it is also possible to use one accumulator for one exhaust gas treatment device.

The operation of the embodiment configured as above will be explained below.

In the past, when a steelmaking facility started operating, there was no steam available.
The induced draft fan 5 is driven by an electric motor 10.

Next, blowing is started, and the W gas that is intermittently generated in the converter 1 is cooled in the cooler 2.

At this time, the cooling water enters the cooler 2 by the pump pressure of the circulation pump 11, absorbs the heat of the exhaust gas, and has a certain pressure (
The temperature of the saturated water and steam (at a pressure sufficient to drive the turbine 9) enters the drum 12, and the saturated water is circulated again by the circulation pump 11.

The pressure inside the drum 12 is regulated to a constant pressure by the pressure regulating valve 18, which stabilizes the circulation of cooling water within the cooler 2 and separates it into saturated water and saturated steam. It is led to the accumulator 13.

The saturated steam thus led is transferred to the accumulator 1
3 is a saving error.

The thus stored steam is adjusted by a flow control valve 21 to a flow rate necessary to rotate the turbine 9 at a desired rotational speed, and is led to 14 independent superheaters.

The independent superheater 14 is heated to a constant temperature by the fuel control valve 22.

When a certain flow rate of saturated steam is superheated to a certain constant temperature in this way, the control valve 23 is gradually opened and the turbine 9 is gradually rotated while it is being warmed up.

Next, when the control valve 23 is fully opened and a specified flow rate starts to flow, or when the rotation speed of the turbine 9 reaches the specified rotation speed, a signal of the steam flow rate or the rotation speed of the turbine 9 is generated. (not shown), the automatic disconnection and connection device 8 is released.

At the same time, the automatic disconnection/connection device γ is connected, and the induced draft fan 5 is switched from the drive motor 10 to the turbine 9 and driven.

Next, during a power outage, the electric motor 1 that drives the induced draft fan 5
Of course, the circulation pump 11, the water supply pump 11, and the instrumentation (not shown) are completely stopped.

At this time, the opening degree of the flow rate control valve 21 is set to a certain opening degree (a steam flow rate that can drive the steam turbine and sufficiently scavenge the inside of the exhaust gas treatment device).

Then, the bypass valve 24 is fully opened, the turbine 9 is rotated, and the -n draft fan 5 is driven once through the automatic disconnection connection device 7, so that the unburned air inside the cooler 2, duct 4, and dust collector 3 is Attracts gas and scavenges the inside of the exhaust gas treatment equipment.

As detailed above, according to the storage invention, steam generated from an exhaust gas treatment device is stored in an accumulator, this steam is used to drive a steam turbine, and the steam turbine and an electric motor are used together to drive an induced draft fan. This makes effective use of the steam that is intermittently generated from the exhaust gas treatment equipment, and also switches the drive of the induced draft fan from an electric motor to a steam turbine, reducing the power consumption of the electric motor that drives the induced draft fan and improving steelmaking. Reduce equipment operating costs.

Furthermore, in the event of a power outage, the unburned gas remaining in the exhaust gas treatment equipment is completely scavenged, eliminating the risk of explosion and improving the safety of steelmaking equipment.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet of an embodiment in which the present invention is applied to an exhaust gas treatment device used in a converter. 5... Induced draft fan, 7, 8... Automatic disconnection and connection device,
9...Steam turbine, 10...Electric motor, 12...
Drum, 13...accumulator, 14...independent superheater.

Claims (1)

[Claims] 1. In the treatment equipment for stray gas generated from steelmaking equipment,
A steam turbine driven by steam generated in an exhaust gas treatment device is connected to an induced draft fan via an automatic disconnection connection device,
On the other hand, the steam turbine and the electric motor are used together to drive the joint induced draft fan using a separate automatic disconnection/connection device between the electric motor and the induced draft fan, and the steam turbine and the electric motor are automatically switched to drive the induced draft fan. Exhaust gas treatment equipment for steel manufacturing equipment.